Shawn Hackett

A gnat-sized insect, the Asian citrus psyllid, forced Dean Mixon to replace about 1,000 orange trees in the past two years on the 50-acre Florida farm his grandfather started in the 1930s. The bug spreads a disease called citrus greening.

Since putting a high around $308 in May of last year, coffee prices have fallen steadily with prices recently dipping as low as $180. According to analysts, most of the decline can be attributed to one producer: Brazil.